DISCOUNT VOUCHER *******

I was given a R100 voucher towards a purchase on spree online shopping website. I went online and purchased a top R179, R50 shipping was also charged. I used the voucher against the total R229 and paid on my c/c R129. Unfortunately the item was not as the picture (incorrect colour milk not white) so I returned the item for a credit only for them to credit me R79? Now they saying I'm responsible for the shipping fee which is unacceptable as I would never order anything if I have to pay for the return shipping or shipping of any item. I paid R129 and should have gotten R129 credit! In fact I also lost the R100 voucher so should have been paid out R100. I have shopped at Spree Many many times over the years but will NEVER Shop at Spree every again. Their attitude stinks!!!!!!